Document Detail

Multiple facets of Arabidopsis seedling development require indole-3-butyric acid-derived auxin.
MedLine Citation:
PMID:  21406624     Owner:  NLM     Status:  MEDLINE    
Levels of auxin, which regulates both cell division and cell elongation in plant development, are controlled by synthesis, inactivation, transport, and the use of storage forms. However, the specific contributions of various inputs to the active auxin pool are not well understood. One auxin precursor is indole-3-butyric acid (IBA), which undergoes peroxisomal β-oxidation to release free indole-3-acetic acid (IAA). We identified ENOYL-COA HYDRATASE2 (ECH2) as an enzyme required for IBA response. Combining the ech2 mutant with previously identified iba response mutants resulted in enhanced IBA resistance, diverse auxin-related developmental defects, decreased auxin-responsive reporter activity in both untreated and auxin-treated seedlings, and decreased free IAA levels. The decreased auxin levels and responsiveness, along with the associated developmental defects, uncover previously unappreciated roles for IBA-derived IAA during seedling development, establish IBA as an important auxin precursor, and suggest that IBA-to-IAA conversion contributes to the positive feedback that maintains root auxin levels.
Lucia C Strader; Dorthea L Wheeler; Sarah E Christensen; John C Berens; Jerry D Cohen; Rebekah A Rampey; Bonnie Bartel
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2011-03-15
Journal Detail:
Title:  The Plant cell     Volume:  23     ISSN:  1532-298X     ISO Abbreviation:  Plant Cell     Publication Date:  2011 Mar 
Date Detail:
Created Date:  2011-04-27     Completed Date:  2011-08-15     Revised Date:  2014-09-22    
Medline Journal Info:
Nlm Unique ID:  9208688     Medline TA:  Plant Cell     Country:  United States    
Other Details:
Languages:  eng     Pagination:  984-99     Citation Subset:  IM    
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MeSH Terms
Arabidopsis / growth & development*,  metabolism
Arabidopsis Proteins / metabolism
Cell Division
Chromosome Mapping
Enoyl-CoA Hydratase / metabolism
Indoleacetic Acids / metabolism*
Indoles / metabolism*
Plant Growth Regulators / metabolism*
Plant Roots / cytology,  growth & development,  metabolism
Seedling / drug effects,  growth & development*
Grant Support
1K99-GM089987/GM/NIGMS NIH HHS; R00 GM089987/GM/NIGMS NIH HHS; S10 RR026399/RR/NCRR NIH HHS; S10 RR026399-01/RR/NCRR NIH HHS; //Howard Hughes Medical Institute
Reg. No./Substance:
0/Arabidopsis Proteins; 0/Indoleacetic Acids; 0/Indoles; 0/Plant Growth Regulators; 061SKE27JP/indolebutyric acid; 6U1S09C61L/indoleacetic acid; EC protein, Arabidopsis; EC Hydratase

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